It is equipped with a key to the security door cross. Why can t I open the lock?

I also got an anti-theft door key not long ago, probably because it is an anti-theft door lock, so the key is difficult to match accurately. (It may also be that I took it with a different key, so the access is greater.) ）

I couldn't open it at first, and then I asked the locksmith to re-grind it, and then I still couldn't open it, so I simply figured it out myself.

The key was opened repeatedly, about a dozen times, and suddenly opened, and then it was researched that the key could not be fully inserted, and it was pulled out a little bit, and the ...... was opened when I heard a twist of the "grid".

It depends on your situation, and I can only talk about my own situation here, hoping it will help you.

There should still be a problem with the key and lock, it is recommended to find a master who helps you match the key and then repair it, and it should be fine to polish it a little.

First of all, see if the gap is aligned with the lock gap, and the level of the key master is not high enough